Changes in Forearc Strain Partitioning with Increasing Obliquity of Convergence, Hikurangi Margin, North Island, New Zealand

新西兰北岛 Hikurangi 边缘弧前应变分区随会聚倾斜度增加的变化

• 批准号: 9019022
• 负责人: Harvey Kelsey
• 金额: $ 7.93万
• 依托单位: Western Washington University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-01-15 至 1995-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9019022&HistoricalAwards=false
• 关键词: Changes; Forearc; Strain; Partitioning; Increasing

Forearc deposits are commonly deformed soon after they are formed due to continuing convergence between plates, however, the style of deformation may vary depending on convergence angles and rates. Also most modern forearcs are largely submarine and are difficult to study. This project will focus on deformation of a Pliocene and Pleistocene forearc exposed on the east coast of North Island, New Zealand, an area experiencing active deformation and seismicity resulting from oblique convergence between the Pacific and Australian plates. The project will involve detailed geologic mapping, strain analysis of fault sets and investigation of Holocene fault and fold deformation in a region having a gradation of convergence angles. Results will increase understanding of both the structure and tectonic evolution of the area and will document strain partitioning in obliquely convergent margins. It will also provide information on possible changes in strain caused by increasing obliquity of convergence. Such information will be applicable in other modern examples of forearc deformation and in interpreting ancient forearc situations.

弧前沉积物通常在其形成后不久即发生变形。 然而，由于板块之间的持续会聚， 变形的类型可以根据会聚角而变化， rates. 此外，大多数现代前弧大部分是海底的， 很难研究。 该项目将重点关注变形的一个 华北东海岸出露的上新世和更新世弧前 岛，新西兰，一个地区正在经历积极的变形和 太平洋斜向会聚引起的地震活动 澳大利亚车牌 该项目将涉及详细的地质 断层组的应变分析和 一个具有梯度的地区的全新世断层和褶皱变形 的收敛角。 结果将增加对两者的了解 该地区的结构和构造演化，并将记录 在斜向会聚边缘的应变分配。 它还将 提供关于以下因素可能导致的应变变化的信息： 增加收敛的一致性。 此类信息将 适用于弧前变形的其他现代例子， 解释古代前弧时期的情况